Originally Posted by mashersmasher
what kind of cooling goes on a 486? i don't see any trace heat sink compound or a spot for the sink to latch on to. should i use a pentium 1 heat sink that sticks to the cpu or did they not have heat sinks on older ones
For 486's, you don't need a HS up to about 40-50 MHz. 50 and beyond should have one. 486's mostly used a passive HS, although some, especially 100-133 MHz, used a small active HS. If yours is a 3.3v part, (most of the slower ones are 5v) up to maybe 75MHz is safe.
Most 486 HS have some sort of clip that grabs the edges of the cpu, since sockets 1-3 do not have tabs on them. Some just use metalized double sided tape. I used to pick up discarded PCs all the time, and have seen a few 486-66's with nothing. Careful, though, even a 33MHz 486 with nothing gets extremely hot.
btw, i've found that most 5v 486's will run perfectly stable and much cooler on 3.3v.